What are the differences between the three types of welding rods j502.j506.j507? Are they alkaline welding rods?

The differences between j502, j506, and j507 welding rods:

1. Composition materials: J502 (E5003) is a titanium-calcium type low alloy structural steel welding rod; J506 (E5016) is a low-alloy structural steel welding rod. Potassium hydrogen type low alloy structural steel welding rod; J507 (E5015) is a low hydrogen sodium type low alloy structural steel welding rod.

2. Welding performance: J502 can be used for non-important structures. Its welding process is good but its crack resistance is low; J506 is a low hydrogen potassium type electrode, which adds arc stabilization to the low hydrogen sodium type. Agent to improve arc process performance, AC and DC power supplies can be used, but the impact performance of the weld metal is reduced.

J507 cannot weld J507 electrodes that match Q345 alloy structural steel. The process performance is not as good as that of acidic electrodes, so short arc welding should be used during welding.

3. Applicable welding machines: J502 is suitable for AC welding machines or DC welding machines with a no-load voltage of not less than 70V; J506 electrodes contain arc stabilizing agents and AC welding machines with a no-load voltage of not less than 70V. , DC welding machines can be used.

J507 electrode does not contain arc stabilizing agent and can only be welded with ZX5 thyristor (thyristor) DC welding machine, ZX7 inverter DC welding machine, and AX series arc welding generator. Ordinary silicon rectifier welding machines such as ZXG ZXE1 have large welding current fluctuations due to the input voltage, and the welding parameters cannot be finely adjusted.

Not all alkaline electrodes. J502 (E5003), acidic welding rod, is a calcium titanium type low alloy structural steel welding rod. J506 (E5016), alkaline welding rod. It is a low hydrogen potassium type low alloy structural steel welding rod. J507 (E5015), alkaline welding rod, is a low hydrogen sodium type low alloy structural steel welding rod. The above three types of electrodes are suitable for welding low alloy steel with Q345 (16Mn) strength level.

Extended information:

Selection of acid welding rods: According to my country's carbon steel welding rod standards, the carbon steel welding rods currently mainly used are E43 series and E50 series. In normal use, acid and alkali welding rods can be identified by looking at the last digit of the welding rod number. The last digits from 0 to 5 are acidic welding rods, and the last digits from 6 to 9 are alkaline welding rods.

If it is difficult to distinguish for a while, you can observe the surface color of the steel core at the end of the welding rod. The end of the alkaline welding rod often has a baked blue color, while the acidic welding rod does not. In addition, it can also be identified from the color of the slag. For alkaline welding electrodes, the back of the slag is dark black and the slag shell is dense; for acidic welding electrodes, the back of the slag is bright black and the slag shell is loose and porous. When welding with an AC arc welding machine, the arc is stabilized by the acidic electrode.

Baidu Encyclopedia--Low hydrogen welding rod

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